linux-kernel - Re: msync(2) bug(?), returns AOP_WRITEPAGE

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Date:	Sat, 13 Oct 2007 00:45:48 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Hugh Dickins" <hugh@...itas.com>
Cc:	"Ryan Finnie" <ryan@...nie.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Erez Zadok" <ezk@...sunysb.edu>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, cjwatson@...ntu.com,
	linux-mm@...ck.org
Subject: Re: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland

Hi Hugh,

On 10/12/07, Hugh Dickins <hugh@...itas.com> wrote:
> But I keep suspecting that the answer might be the patch below (which
> rather follows what drivers/block/rd.c is doing).  I'm especially
> worried that, rather than just AOP_WRITEPAGE_ACTIVATE being returned
> to userspace, bad enough in itself, you might be liable to hit that
> BUG_ON(page_mapped(page)).  shmem_writepage does not expect to be
> called by anyone outside mm/vmscan.c, but unionfs can now get to it?

Doesn't msync(2) get to it via mm/page-writeback.c:write_cache_pages()
without unionfs even?

                                       Pekka
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